Effects of Water and Nitrogen Coupling on Spring Tomato Growth and Soil Nitrate Nitrogen Accumulation in Greenhouse of Northern Weihe River Basin
In order to study the suitable nitrogen and irrigation application rate on early-spring facility tomato in northern Weihe river basin of Shaanxi,the experiment used'Jinpeng No.10'tomato as test plant,taking local usual N fertilizer amount(450 kg·N/hm2)and irrigation amount(3000 m3/hm2)as the control(CiTi).Six treatments were designed by different nitrogen rates(Ci-conventional treatment,C2-reduction 20％,C3-reduction 40％)and irrigation rates(Ti-conventional treatment,T2-reduction 30％).Fertilizers were applied by water-fertilizer integration at different tomato growth stages.Tomato yield,quality and soil nitrate nitrogen were recorded and analyzed.The results showed that there was no significant difference in the tomato yield between nitrogen-water reduction treatments and conventional treatment.However,the average yield of C3 level was significantly lower than conventional and C2 treatment when N application rate was the main analysis factor.Except for protein content,other tomato quality indexes were no significant differences.The membership function method showed that the quality results ranking of C2T2 was the best.Soil nitrate-N accumulation in 0-200 cm underground decreased with the decrease of N application rate,while increased with the decrease of irrigation amount.The total nitrate-N amounts of different treatments ranged from 1028.38 to 1302.80 kg/hm2,accumulation of soil layer within 100 cm accounted for 59.9％-69.5％of the total nitrate-N amounts.From the balance of irrigation,fertilizer input and yield output,CiT2,C2T1 is basically the same as the control,C2T2 increases the benefit by 2050 yuan/hm2.
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